I cut and pasted my child’s school’s multi page complaints policy without reading it myself, then asked it to show me the stages I need to follow as a sequence diagram and it can up with this:

@startuml actor Parent participant "Class Teacher" as CT participant "Head of School" as H participant Clerk

== Level 1 ==

Parent -> CT: Informal Complaint CT -> H: Meeting Request H -> CT: Meeting Scheduled CT -> Parent: Meeting Scheduled Parent -> CT: Attend Meeting CT -> H: Meeting Summary H -> Clerk: Meeting Summary Received

== Level 2 ==

Parent -> Clerk: Formal Complaint Clerk -> H: Formal Complaint Received H -> Clerk: Response Preparation Clerk -> Parent: Formal Complaint Response Parent -> Clerk: Request for Level 2 Meeting Clerk -> H: Request for Level 2 Meeting Received H -> Parent: Level 2 Meeting Scheduled @enduml